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Other Names: TDI, toluene-2,4-isocyanate; commercial grades are often mixtures of the 2,4- isomer and the 2,6- isomer
Formula: CH3C6H3 (NCO)2
Sp. Gr.: 1.2
Viscosity: Variable depending on mixture of isomers but normally in the range of 7 to 165 cPs.
Remarks: Water-white to pale yellow liquid with a sharp, pungent odor; b.p. 250°C / 418°F, flash point 132°C / 270°F, m.p. (pure) 20°C / 68°F, vapor pressure 0.01 mm @ 20°C / 68°F; soluble in ether, acetone and other organic solvents. Used in making polyurethane foams q.v., elastomers and resins. Irritating to eyes and nose; causes burns.
Pump Notes: Cast iron construction is usually acceptable. Viton®, PTFE or Kalrez® elastomers are recommended. TDI is normally handled with a sealless design pump.
Viton® and Kalrez® are registered trademark of DuPont Dow Elastomers®, L.L.C.